QUOTE(batuapi @ Oct 20 2008, 09:01 PM)
A little curve is normal, but you do NOT depend on it to adjust the action.
what are you saying ??
of course you do !!
the string action depends partly on the trussrod !! Trussrod is not the only parameter, OK, but it has a serious influence.
tightening the trussrod will bring the strings closer to the neck between the 1st fret till the 12th fret, approximatively. Whereas the higher frets are not impacted.
QUOTE(batuapi @ Oct 20 2008, 09:01 PM)
Truss rod tightening might snap/crack your neck if you go more than 1/4th at a time.
Not true. You can do more than 1/4th, depending on how tight is the trussrod in the 1st place.
But the fine tuning will be done with very little increment.. because once you're reaching the correct setting, every 1/10th of a turn will have a drastic effect on the playability of the guitar.